An infamous Gold Coast man has confessed to murdering father Greg Dufty, two months before killing his own ex-girlfriend.

Lionel Patea laughed with his brother Nelson in the dock at Brisbane's Supreme Court this afternoon before the pair admitted to the murder of Dufty in July 2015.

The former bikie entered a plea of guilty to the charge of murder, while his brother Nelson pleaded guilty to the lesser charge of manslaughter.

Lionel Patea laughed in the dock with his brother before admitting to the murder. (AAP)Mr Dufty's family and friends leaving court today after hearing the guilty pleas entered. Picture: AAP (AAP)

Lionel Patea is infamously known as the man who brutally killed his ex-partner Tara Brown in September 2015.

Another man, Aaron Crawford, today pleaded guilty to manslaughter and interfering with a corpse over Dufty’s death.

The father-of-two disappeared in July 2015.

He was lured to the Gold Coast Hinterland and bashed to death over a drug debt.

Lionel Patea has already been convicted of killed ex-girlfriend Tara Brown in September 2015. (AAP)Patea last year admitted to killing his former partner just two months after the disappearance of Greg Dufty. (AAP)